package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.beans.Transient;
import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 添加新套餐,同时需要保存套餐和菜品的关联关系
     * @param setmealDTO
     */
    @Override
    @Transactional //加入事务
    public void saveWithDish(SetmealDTO setmealDTO) {
        // 新增套餐的基本信息
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        // 添加套餐的基本信息
        setmealMapper.insert(setmeal);

        // 获得insert(setmeal)里的套餐id，方便添加菜品
        Long setmealId = setmeal.getId();

        // 每个套餐id里的加上不同的菜品
        List<SetmealDish> setmealDishes  = setmealDTO.getSetmealDishes();
        if(setmealDishes != null && setmealDishes.size()>0){
            for (SetmealDish setmealDish : setmealDishes) {
                setmealDish.setSetmealId(setmealId);
            }
            // 同一个套餐批量添加多个菜品
            setmealDishMapper.insertBatch(setmealDishes);
        }

    }

    /**
     * 套餐分页
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    @Override
    @Transactional // 加入事务
    public void delete(List<Long> ids) {
        // 起售中的套餐不能删除
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.getById(id);
            if(StatusConstant.ENABLE == setmeal.getStatus()){
                //起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        // 删除套餐的基本信息
            setmealMapper.deleteSetmealByIds(ids);
        // 删除套餐与菜品的关联表
            setmealDishMapper.deleteBySetmealId(ids);
    }
    /**
     * 修改套餐
     * @param setmealDTO
     */
    @Override
    @Transactional //开启事务
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //1、修改套餐表，执行update
        setmealMapper.update(setmeal);

        //套餐id
        Long setmealId = setmealDTO.getId();

        //2、删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
        setmealDishMapper.deleteBySetmealId(Collections.singletonList(setmealId));

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        //3、重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
        setmealDishMapper.insertBatch(setmealDishes);
    }
    /**
     * 根据id查询对应的套餐信息
     * @param setmealId
     * @return
     */
    @Override
    public SetmealVO selectById(Long setmealId) {
        SetmealVO setmealVO = new SetmealVO();
        // 根据id 即setmeal_id查询套餐基本信息
        Setmeal setmeal = setmealMapper.selectById(setmealId);
        BeanUtils.copyProperties(setmeal,setmealVO);
        // 根据 setmealId 查找对应的菜品信息
        List<SetmealDish>  setmealDishes = setmealDishMapper.selectBySetmealId(setmealId);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 启用或者禁用套餐
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            // 这里需要使用两个表 setmeal_dish表和dish表
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }
    /**
     * 用户端 --- 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 用户端 ---- 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
